noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The cyclic dienone 3,4,4,5-tetramethylcyclohexa-2,5-dienone uncountable

Etymology

From penguin + -one, after the resemblance of its structure to a stylized penguin.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.